DP Biology (first assessment 2025)

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Question SPM.1A.HL.TZ0.27

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Date May Specimen-2023 Marks available [Maximum mark: 1] Reference code SPM.1A.HL.TZ0.27
Level HL Paper 1A Time zone TZ0
Command term Question number 27 Adapted from N/A
27.
[Maximum mark: 1]
SPM.1A.HL.TZ0.27

The diagram shows where the exchange of substances between blood and tissue fluid occurs in a capillary bed.


What explains the movement of solutes between blood and tissue fluid at region X?


A.  Blood plasma has a higher concentration of solutes than tissue fluid.

B.  Tissue fluid has a more negative water potential than blood plasma.

C.  Hydrostatic pressure is higher in blood than in tissue fluid.

D.  The permeability of capillary walls is highest at region X.

[1]

Markscheme

C

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